查询结果的 Couchbase N1QL Select 键

Question

我正在尝试为特定字段具有重复值的所有条目获取文档键。

我有这个查询来查找重复项：

SELECT t1.somefield, t1.fieldcount FROM
(SELECT somefield, fieldcount FROM `mybucket` WHERE `somefield` IS NOT MISSING GROUP BY somefield
LETTING fieldcount = COUNT(somefield) ) as t1
WHERE t1.fieldcount > 1;

并且需要获取每个结果的 META().id。我可以在单个查询中执行此操作吗？

Answer 1

使用ARRAY_AGG(META().id)

SELECT d.somefield, cnt, docids
FROM mybucket AS d
WHERE d.somefield IS NOT NULL
GROUP BY d.somefield
LETTING cnt = COUNT(1), docids = ARRAY_AGG(META(d).id)
HAVING cnt > 1;

或

SELECT d.somefield, ARRAY_LENGTH(docids) AS cnt, docids
FROM mybucket AS d
WHERE d.somefield IS NOT NULL
GROUP BY d.somefield
LETTING docids = ARRAY_AGG(META(d).id)
HAVING ARRAY_LENGTH(docids) > 1;

查询结果的 Couchbase N1QL Select 键

Couchbase N1QL Select key for query results

couchbase

n1ql